Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ef9a858b66a3fb…

MALICIOUS

PDF

48.0 KB Created: 2020-08-31 12:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ae9da8b8b6c2c5dd638336e52fd2916 SHA-1: 101a0ec573e90581d209f32089d96416835b141f SHA-256: 85ef9a858b66a3fb417108dffcf1ad6d9f8cac0f8ecd044189a6141d6907f26c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=thousand+plateaus+pdf'. Additionally, it features a mass external PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0434/7700/8548/files/connected_mathematics_grade_7.pdf'. The document body, though heavily obfuscated, contains these URLs, suggesting an attempt to lure users to malicious content under the guise of providing legitimate documents.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=thousand+plateaus+pdf
    • https://cdn.shopify.com/s/files/1/0434/7700/8548/files/connected_mathematics_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/differential_equations_polking_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/39779969661.pdf
    • https://cdn.shopify.com/s/files/1/0430/6832/6042/files/decking_sheet_weight.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/stardew_valley_go_back_a_day.pdf
    • https://static.usrfiles.com/ugd/f3cb45_27987e6369794fd1826e9812093485b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_455f551428b740809a72f88b29ea7ddc.pdf
    • https://static.usrfiles.com/ugd/f459ea_90e93c83308440d3a1e4e32e76f8057e.pdf
    • https://static.usrfiles.com/ugd/a107db_0b3a18a723f84bc08de2f03a28a01e42.pdf
    • https://static.usrfiles.com/ugd/b8c837_07194948e0f94b1e95d745f6ae29c3ba.pdf
    • https://static.usrfiles.com/ugd/82e28d_894d58c4d6524265ad4c4fb0ca96397a.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/fuketufidelewigunatej.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0910/files/kosalorufalin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ff.bin
4cabaeeb039bc4274b0cec4521ae6ea3fda3c9447459da8d992177fabb16cc0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FF 4816 bytes
font_01_sfnt_off0000825d.bin
1892735f42683eb10295b9fa58fdb859583ba3aa070cd5904244b8d1b1819f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825D 10224 bytes
font_02_sfnt_off0000a55a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA55A 4324 bytes

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